This story appears in the April 2011 issue of National Geographic magazine. When? This is the question that has brought two of the world's leading volcano scientists to the center of Africa ...

ANCHORAGE, Alaska — A volcano near Alaska's largest city is showing new signs of unrest, with experts saying the likelihood of an eruption at Mount Spurr in the next few weeks or months has ...

The ash cloud hovering above Argentine Northern Patagonia since Saturday after the eruption of the Puyehue volcano in the Chilean Andes may reach the city of Buenos Aires on Tuesday, experts assured.

The ash cloud from the Chilean Volcano Puyehue-Cordón Caulle in eruption since June 4 has reached Cape Town airspace affecting flights in and out of Cape Town International Airport. One of the ...